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When you are a liquid and want to become a gas, you need to find a lot of energy. Once you can direct that energy into your molecules, they will start to vibrate. If they vibrate enough, they can escape the limitations of the liquid environment and become a gas. When you reach your boiling point, the molecules in your system have enough energy to become a gas. The reverse is true if you are a gas.
(It is also sometimes called fusion .). Another change that can occur for some solids is to change directly into a gas instead of changing into a liquid, and that is called sublimation. The reverse of this process can also occur. Some gases can be cooled down and changed directly into a solid.his kind of phase change--liquid to gas--is called evaporation or vaporization. Water vapor can in turn be cooled to form liquid water. This kind of phase change--from gas to liquid--is referred to as condensation.